(1) Arthur C Clarke, English fan-turned-pro. Now that he's passed from among us it's used mostly in puns like Willis's "ACColade — Ego's favorite drink".

(2) Of a group: Adolescent California Crowd. Dave Rike, Terry Carr, Pete Graham, and Boob Stewart, back when they were… adolescent, that is. Stewart was apparently responsible for much of the juvenility before he went into a Papist theological seminary.